The detailed hydrographic network presents all the flow channels visible in the territory of 12 MRCs in Montérégie. This photo-interpretation project was carried out on a scale varying from 1:500 to 1:2000, using orthophotos (spring 2020 at 20 cm resolution for the territory excluding CMM and spring 2018 at 10 cm resolution for the territory in CMM) and shaded relief derived from LiDAR data (2008 to 2020). The project was carried out as part of the Regional Data Acquisition Program on Wetlands and Water Environments (PRADMHH) and received funding from the Regional and Rural Development Fund (FRR) of the MAMH's Montérégie Regional Directorate.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**